A and B can complete a piece of work in 5 days working together. If A had worked twice as fast, the work would have completed in 4 days. In how many days can A alone complete the work?
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Step-by-step explanation:
Let the speed of B be y work/day. Two workers A and B working together completed a job in 5 days. If A worked twice as efficiently as he actually did and B worked 31 as efficiently as he actually did the work would have been completed in 3 day. ∴ A alone could complete the work in 425=641 days.
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